‘Lemon & Poppy Seed Sourdough’ · Crust & Crumb Academy

‘Lemon & Poppy Seed Sourdough’

The "Secret Ingredient" for Stronger Sourdough: Why I’m Adding Lemon Juice to My Bake

I’ve been experimenting with my sourdough, and I’ve found a game-changer for anyone looking to level up their crust and crumb: Lemon Juice.

If you’ve never tried it, here is why adding just 1 tablespoon of lemon juice (per ~450g of flour) is a total pro move:

The pH Factor:

Standard bread dough typically sits at a pH of 5.0–5.5. By adding 1 tbsp of lemon juice (pH ~3.0) per 450g of flour, we slightly lower the dough's overall pH. This shift has several technical advantages:

1. Gluten Strengthening (The "Tightening" Effect):

An acidic environment promotes better protein cross-linking. This is a massive win when working with Fresh Milled Flour. The bran in fresh-milled grain acts like tiny knives that can shear gluten strands; the lower pH "toughens" the gluten, allowing it to withstand the mechanical stress of the bran and maintain a better vertical rise.

Think of it as the balance between two "personalities" of your dough:

Elasticity (The Snap-Back): Like a rubber band. This is the dough’s ability to return to its original shape after being stretched. This comes from your gluten strength (strengthened by the lemon juice).
Extensibility (The Stretch): Like taffy. This is how far the dough can be pulled without tearing. This is influenced by the hydration and inclusions like fat and syrups like honey.

2. Enzymatic Control:

Lowering the pH helps regulate enzymatic activity (specifically amylase). This prevents the dough from becoming too "slack" or gummy during long fermentations, which is critical when you’re pushing a high hydration and a long cold retard.

3. Enhanced Maillard Reaction & Shelf Life:

The increased acidity interacts with sugars to accelerate the Maillard reaction. This results in a deeper, more complex crust color. Furthermore, the lower pH acts as a natural antimicrobial, inhibiting mold growth and extending the bread's freshness.

Results: High-tension gluten, superior oven spring, and a "shatter-crisp" crust with a significantly brighter flavor profile.

I took my ‘Pain de Campagne’ sourdough recipe, which I posted several weeks ago, and added the zest of 1 lemon, 1 Tbsp of lemon juice (this increased the hydration from 75% to 78%), 1 Tbsp of honey, and 2 Tbsp of poppy seeds.

‘Lemon & Poppy Seed Sourdough’

Formula:

Total weight: 863g

Total hydration: 78%

Total flour: 453g; 90% Bread flour & 10% Whole Wheat flour

75% water, 2% Salt, 1.2% Lemon zest, 3% Lemon juice, 5% Poppy seeds, 4% Honey, 20% Starter

Ingredients:

• Bread flour – 362g

• Whole wheat flour – 45g

• Water – 294g

• Salt – 9g

• Lemon zest – 5g - 1 lemon

• Lemon juice– 15g - 1 Tbsp

• Poppy seeds – 23g - 2 Tbsp

• Honey – 19g - 1 Tbsp

• Starter – 91g (100% hydration)

Method:

- Build the levain overnight (1:5:5), then mix everything except the poppy seeds and let it fermentolyze for 45 minutes.

- Bulk fermentation included three stretch & folds at 45-minute intervals, adding the poppy seeds during the second fold. Proof to a 60% increase in volume.

- After shaping, it went into an 8-inch oval banneton for an overnight (19 hr.) cold retard.

Baked in a preheated Dutch oven at 500°F (covered 20 min, then uncovered at 450°F for 10 min).

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